On Thu, Nov 18, 2021 at 10:55:00AM +0100, Simon Hoffmann wrote:
> > 
> > 
> > >GMail still wont accept my IPv6 submitted mails.
> > 
> > Are you using ipv6 connectivity over tunnel from tunnelbroker.net?
> 
> Nope. My relays have "real" IPv6 /64 networks assigned to their interfaces 
> natively.
> 
> However, I'd still like to only use IPv4 when sending messages.

Why?  Why not fix the IPv6 issue?  Our servers deliver to gmail over IPv6 with
no issues.

> Suggestions?

Set a fixed IPv4 source address using the src parameter in the action directive
of your smtpd.conf.

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